CodeIgniter 3 is the legacy version of the framework, intended for use with PHP 5.6+. This version is in maintenance, receiving mostly just security updates.
CodeIgniter 4 is the latest version of the framework.
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general/welcome
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installation/index
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overview/index
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tutorial/index
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contributing/index
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general/index
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libraries/index
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database/index
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helpers/index
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overview/index
general/requirements
general/welcome
installation/index
general/index
libraries/index
database/index
helpers/index
tutorial/index
general/credits